Flow injection analysis of potassium using an all-solid-state potassium-selective electrode as a detector.

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Sensor Technology

Background:

• Accurate potassium measurement is crucial in various fields, including clinical diagnostics and food analysis.
• Conventional methods for potassium determination can be time-consuming and require complex sample preparation.
• Development of rapid, sensitive, and stable potassium sensors is an ongoing research area.

Purpose of the Study:

• To develop a rapid and sensitive flow injection analysis (FIA) system for potassium determination.
• To fabricate a stable all-solid-state potassium-selective electrode for use in the FIA system.
• To validate the performance of the developed FIA system using real-world samples.

Main Methods:

• Fabrication of an all-solid-state potassium-selective electrode using a polypyrrole/poly(4-styrenesulfonate) film and a valinomycin-based membrane.
• Integration of the developed electrode into a flow injection analysis (FIA) system.
• Analysis of potassium concentration in soy sauce and control serum samples.

Main Results:

• The all-solid-state potassium sensor exhibited long-term potential stability.
• The FIA system achieved a rapid assay rate of 150 samples per hour.
• The sensitivity of the FIA system was comparable to conventional batch methods.
• Results from soy sauce and serum samples showed good agreement with conventional measurements.

Conclusions:

• The developed FIA system with an all-solid-state potassium sensor provides a rapid, sensitive, and reliable method for potassium determination.
• This method offers a viable alternative to conventional techniques for analyzing potassium in complex matrices.
• The stable electrode design contributes to the robustness and practicality of the analytical system.